Coupling



Patented Nov. 13, 1928.

I UNITED STATES CHARLES KOSNICK, on NEW YORK, N. Y.

AT-ET COUPLING.

Application filed January 25, 1926. Serial No. 83,641.

This invention relates to improvements in couplings for flexible conduits or armored conductors.

The primary object of the invention resides in a coupling for the purpose of connecting the endof an armored conductor with an outlet box, the same being so constructed as to expedite the connection and to positively hold the conductor in position. 7 H

Another object of the invention is to pro vide a coupling which is adjustable for connecting different size conduits or conductorswith the standard outlet box.

A further object of the invention is the provision of a coupling constructed of two sections, one of which is adapted to be stationarily supported upon the walls of the outlet box, while the other section is movable with respect thereto but serves to co-act with the stationary section for clamping the end of a conduit therebetween.

A. still further object is to provide a coupling of the above character which is simple in construction, easy to assemble and mexpensive of manufacture.

With these and other objects in view, the invention resides in certain novel construction and combination and arrangement of parts, the essential features of which are hereinafter fully described, are particularly pointed out in the appended claims, and are illustrated in the accompanylng drawing, in which Figure 1 is a fragmentary sectional view through a portion of an outlet box, showing in side elevation the manner of connecting one end of an armored conductor thereto.

Figure 2 is a bottom plan view.

Figure 3 is a vertical longitudinal sectional view on the line 3-3 of Figure 2.

Figure 4 is a vertical transverse sectional View on the line 44 of Figure 1.

Figure 5 is a collective perspective view of the several parts which constitute my improved coupling.

Referring more particularly to the drawing, the reference numeral 10 designates a portion of an outlet or junction box having a knock-out opening 11 in one of the walls thereof. My improved coupling is shown in its entirety as at 12 and comprises a pair of co-acting sections or parts 13 and 14.

The part 13 comprises a threaded nipple 15 of a diameter to freely pass through the opening 11 in the outlet box, and in which is provided an annular flange 16, for limiting the insertion of "the nipple through the opening. I

The flange abutsthe outside of the outlet box and'is theld thereagainst by a clamping nut 17 which engages the threads on said nipple and which is adapted to be screwed tight a ainst 7 the inner wall of said outlet box to flrmly hold the section 13 upon the box. The nipple is provided with a bore 18 and extending from the flange 17 is a jaw 19 which is ap proximately semi-circular in cross section. The jaw 19 is provided with an extending finger 20 having an inner curved surface 21. The jaw 19 is also provided with an ear 22 having a threaded-opening 23 therein. In use, the end of the armored conductor 24 to be connected is inserted through the bore 18 go as to extend to the interior of the outlet The section 14 above referred to comprises a single piece of material which is twisted to provide a aw 25, of curved shape to fit about the armored conductor 24. The part 14 is also provided with an car 26 having an opening 27 therein adapted to align with the openlng 23 in the car 22. A clamping screw 29 is passed through the opening 27 and co-acts with the thread in the walls of the opening 23 for bringing the two parts into clamping engagement about the conductor. The conductor 24 is of the flexible conduit type which is provided with a metallic helically wound outer covering. When the movable section 14 is brought into clamping engagement with the stationary section 13, the clamping face of the jaw 25 is forced down into the valley between the humps on the conductor. and the conductor forced against the jaw 19. The upper end of the part 14 co-acts with the curved surface 21 which forces the jaw 25 into engagement with one side of the hump while the jaw 19 engages the top of the same. When the screw 29 is turned tight, the parts 13 and 14 co-act to provide a restricted passage for the conductor and serve to securely clamp the conductor, which may be bent adjacent the coupling without fear of the same pulling out of the outlet box. An expansion spring 30 encircles the shank of the screw 29 and is interposed between the ears 23 and 26 to normally force the co-acting jaws toward each other.

While I have described what I deem to be the most desirable embodiment of my invention, it is obvious that many of the details may be varied without in any way departing from the spirit of my invention, and I therefore do not limit myself to the exact details of construction herein set forth nor to anything less than the whole of my invention vlimited only by the appended claims.

What is claimed as new is 1. A coupling for connecting a condult to a junction box comprising a pan of separable parts, one of said parts including a body from said body, said'other part constituting a loose jaw positioned between said finger and said body and engaging sald finger, and

' means for holding said parts in co actin clamping engagement, substantially as and for the purpose specified;

2. A coupling for connecting a conduitto a junction box comprising a pair of separable.

parts, one of said parts including a body adapted to be secured in the Walls of-a junction box, said body having a passage therethrough for the insert-ion of the conduit to be held, a jaw provided on said body, a finger cxtendin from said jaw and being spaced from said body, said other part constituting a loose jaw positioned between said finger and said bod for engaging said finger, and means for holding said parts in co-acting clamping engagement, said means including opposed ears provided on said parts, a set screw freely passing through one of said ears and having threaded engagement with the other of said ears, and an expansion spring interposed between said ears, substantially as and for the purpose, specified. V a Q In testimony whereof- I haveaffixed my signature.

CHARLES KOSNICK, 

